Ok, i`ll give it a try - thanks but first i`ll make myself another installation so i can test and try with no risk. For the moment i`ve reverted to 10.5.4 and i think i`ve solved my problem with shuting down - at least i hope it`s solved. It seems that it was just overheating and shuting itself down. I`ve deleted AppleCPUThermo.kext and - system is quite cool and quiet now...it`s working for over 3 hours now and nothing happened so i hope i can consider it solved... anyway i wonder why this never happened before - and it does happen on the new Voodoo kernel ?

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